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Table 3 - Combustion Oxygen Levels for
100% Firing Rate
100% Fire Rate
Temp (ºF)
O2
130
4.3
<100ppm
120
4.5
<100ppm
110
4.7
<100ppm
100
4.8
<100ppm
90
5.0
<100ppm
80
5.1
<100ppm
70
5.1
<100ppm
60
5.2
<100ppm
50
5.3
<100ppm
40
5.4
<100ppm
30
5.4
<100ppm
20
5.4
<100ppm
10
5.4
<100ppm
0
5.4
<100ppm
-10
5.4
<100ppm
-20
5.4
<100ppm
-30
5.4
<100ppm
-40
5.4
<100ppm
OPEN
CLOCKWISE
DUCT TO AIR
/FUEL VALVE
BLOWER AIR
OUTLET
Figure 4.5
Iris Air Damper Location
24. Change the firing rate to 40%. Allow time for
the combustion analyzer to settle. Check the
measured oxygen reading to insure that it is
still within the range as per Table 1.
25. Continue this procedure until oxygen levels
at 40%, 16% and 100% firing rates are
within the ranges specified in Tables 1, 2
and 3.
4.4 UNIT REASSEMBLY
Once combustion calibration is set properly, the
unit
can
be re-assembled
operation. Proceed as follows:
NOx (corrected to
CO
3% O
)
2
<40ppm
<40ppm
<35ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
<30ppm
USE A 1/2" WRENCH TO
INCREASE/DECREASE
AIR INTAKE
for
permanent
INITIAL START-UP
1. Put the green ON/OFF switch in the off
position. Disconnect the AC power supply to
the unit.
2. Shut off the gas supply to the unit.
3. Reinstall the brass hex nut back on the
regulator.
4. Remove all of the manometers and barbed
fittings and reinstall the pipe plugs using a
suitable thread compound.
5. Remove the combustion analyzer probe
from the tapped hole in the exhaust
manifold. Replace the NPT plug previously
removed in para. 4.2.3, step 1.
6. Replace the unit's panels.
4.5 OVER-TEMPERATURE LIMIT
SWITCH
The over-temperature limit switches are located
on the plate to the left of the boiler shell. One is
a fixed manual reset switch that will shutdown
and lock out the boiler if the water temperature
reaches 210°F. The other is an adjustable auto
reset which allows the boiler to restart, once the
temperature drops below its temperature setting.
Figure 4.6 shows the location of the over
temperature limit switch.
OVER TEMP SWITCH-MANUAL RESET
OVER TEMP SWITCH-AUTO RESET
Figure 4.6
Over Temperature Limit Switch Location
4-5
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